Starting today, we will extend availability of our current Windows 8.1, Windows 8.1 Pro and Windows Server 2012 R2 RTM builds to the developer and IT professional communities via MSDN and TechNet subscriptions. The Windows 8.1 RTM Enterprise edition will be available through MSDN and TechNet for businesses later this month.

Have you guys seen Azure Pack for on premise deployments? Makes managing and provisioning services as easy as they are on Windows Azure (includes the Management Portal and essentially on premise versions of all Azure services)